ICSx⁵ app
ICSx⁵ is Time tool that is open source under the GPL-3.0-only license. ICSx⁵ allows you to add/subscribe and manage external (Webcal) and local (i.e. Dropbox, adb push etc) iCalendar/.ics files on your Android device.Add high days and holidays, your sports teams events, time tables of your school/university or any other event files that come in ics/ical format. The app will import these events for you and displays it in your favorite calendar app on your Android – it integrates seamlessly into your device.
* Subscribe to Webcal feeds (= synchronize at regular intervals) e.g. shared calendars from icloud.com
* Subscribe to local .ics (iCalendar) calendar files
* Allows to open webcal:// and webcals:// URLs, e.g. from your Web browser
* Seamless integration to other calendar apps
* Set a sync schedule
* Intelligent update checker to save bandwidth
* Authentication and HTTPS supported